/* LzFind.h -- Match finder for LZ algorithms
   2009-04-22 : Igor Pavlov : Public domain */

#ifndef __LZ_FIND_H
#define __LZ_FIND_H

#include "Types.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef UInt32 CLzRef;

typedef struct _CMatchFinder
{
    Byte* buffer;
    UInt32 pos;
    UInt32 posLimit;
    UInt32 streamPos;
    UInt32 lenLimit;

    UInt32 cyclicBufferPos;
    UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */

    UInt32 matchMaxLen;
    CLzRef* hash;
    CLzRef* son;
    UInt32 hashMask;
    UInt32 cutValue;

    Byte* bufferBase;
    ISeqInStream* stream;
    int streamEndWasReached;

    UInt32 blockSize;
    UInt32 keepSizeBefore;
    UInt32 keepSizeAfter;

    UInt32 numHashBytes;
    int directInput;
    size_t directInputRem;
    int btMode;
    int bigHash;
    UInt32 historySize;
    UInt32 fixedHashSize;
    UInt32 hashSizeSum;
    UInt32 numSons;
    SRes result;
    UInt32 crc[256];
} CMatchFinder;

#define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)
#define Inline_MatchFinder_GetIndexByte(p, index) ((p)->buffer[(Int32)(index)])

#define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)

int MatchFinder_NeedMove(CMatchFinder* p);
Byte * MatchFinder_GetPointerToCurrentPos(CMatchFinder* p);
void MatchFinder_MoveBlock(CMatchFinder* p);
void MatchFinder_ReadIfRequired(CMatchFinder* p);

void MatchFinder_Construct(CMatchFinder* p);

/* Conditions:
     historySize <= 3 GB
     keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB
 */
int MatchFinder_Create(CMatchFinder* p, UInt32 historySize,
                       UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
                       ISzAlloc* alloc);
void MatchFinder_Free(CMatchFinder* p, ISzAlloc* alloc);
void MatchFinder_Normalize3(UInt32 subValue, CLzRef* items, UInt32 numItems);
void MatchFinder_ReduceOffsets(CMatchFinder* p, UInt32 subValue);

UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte* buffer, CLzRef* son,
                         UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue,
                         UInt32* distances, UInt32 maxLen);

/*
   Conditions:
   Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func.
   Mf_GetPointerToCurrentPos_Func's result must be used only before any other function
 */

typedef void (*Mf_Init_Func)(void* object);
typedef Byte (*Mf_GetIndexByte_Func)(void* object, Int32 index);
typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void* object);
typedef const Byte* (*Mf_GetPointerToCurrentPos_Func)(void* object);
typedef UInt32 (*Mf_GetMatches_Func)(void* object, UInt32* distances);
typedef void (*Mf_Skip_Func)(void* object, UInt32);

typedef struct _IMatchFinder
{
    Mf_Init_Func Init;
    Mf_GetIndexByte_Func GetIndexByte;
    Mf_GetNumAvailableBytes_Func GetNumAvailableBytes;
    Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos;
    Mf_GetMatches_Func GetMatches;
    Mf_Skip_Func Skip;
} IMatchFinder;

void MatchFinder_CreateVTable(CMatchFinder* p, IMatchFinder* vTable);

void MatchFinder_Init(CMatchFinder* p);
UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder* p, UInt32* distances);
UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder* p, UInt32* distances);
void Bt3Zip_MatchFinder_Skip(CMatchFinder* p, UInt32 num);
void Hc3Zip_MatchFinder_Skip(CMatchFinder* p, UInt32 num);

#ifdef __cplusplus
}
#endif

#endif